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Cloneable.hpp

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 * This file is part of openWNS (open Wireless Network Simulator)
 * _____________________________________________________________________________
 *
 * Copyright (C) 2004-2007
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 * _____________________________________________________________________________
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 * openWNS is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 2 as published by the
 * Free Software Foundation;
 *
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 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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#ifndef WNS_CLONEABLE_HPP
#define WNS_CLONEABLE_HPP

#include <WNS/Assure.hpp>
#include <WNS/TypeInfo.hpp>
#include <WNS/Exception.hpp>
#include <ostream>
#include <memory>

namespace wns {

    class CloneableInterface
    {
    public:
        virtual
        ~CloneableInterface()
        {}

        virtual CloneableInterface*
        clone() const = 0;
    }; // class CloneableInterface

    template< class T >
    class Cloneable :
        public virtual CloneableInterface
    {
    public:
        virtual CloneableInterface*
        clone() const
        {
            assure(
                TypeInfo::create(*this) == TypeInfo::create<T>(),
                "wns::Cloneable: " <<
                "Cloned and orignal type are different! \n" <<
                "Orignal type: " << TypeInfo::create(*this) <<
                "   <->   Clone type: " << TypeInfo::create<T>());

            T* t = new T( *(static_cast<const T*>(this) ) );

            return t;
        }
    }; // class Cloneable


    class CloneNotSupported :
        public Exception
    {
    public:
        CloneNotSupported() :
            Exception("CloneableInterface not supported.")
        {}

        template <typename T>
        CloneNotSupported(T* t) :
            Exception("CloneableInterface not supported for: ")
        {
            (*this) << TypeInfo::create(*t);
        }

        ~CloneNotSupported() throw() {}
    };

    class NotCloneable :
        virtual public CloneableInterface
    {
    public:
        virtual CloneableInterface*
        clone() const
        {
            throw CloneNotSupported(this);
        }
    };

    template <typename T>
    T*
    clone(T* t)
    {
        CloneableInterface* ci = t->clone();
        assureType(ci, T*);
        // can't use static cast here
        return dynamic_cast<T*>(ci);
    }

    template <typename T>
    std::auto_ptr<T>
    clone(const std::auto_ptr<T>& t)
    {
        CloneableInterface* ci = t->clone();
        assureType(ci, T*);
        // can't use static cast here
        return std::auto_ptr<T>(dynamic_cast<T*>(ci));
    }
} // namespace wns

#endif // WNS_CLONEABLE_HPP

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